Hydraulic drive and flywheel integrated power device

Abstract

The utility model discloses a hydraulic drive and flywheel integrated power device, which is characterized in that a hydraulic motor is in one-way transmission connection with one end of a transmission shaft through a first torsion coupling, and a hydraulic linkage pump set is in one-way transmission connection with the other end of the transmission shaft through a second torsion coupling; a flywheel fixedly arranged on the outer side of a transmission shaft provides rotation inertia for the transmission shaft, a low-position oil tank supplies oil to a hydraulic motor and a hydraulic linkage pump set, oil outlet pipelines of the hydraulic motor and the hydraulic linkage pump set are communicated with an oil inlet pipeline of a load, and a first proportional control valve and a second proportional control valve respectively control the pressure entering the two sides of a motor variable cavity and a linkage pump variable cavity. The first swing angle sensor and the second swing angle sensor monitor the swing angles of the swash plates in the motor variable cavity and the linkage pump variable cavity respectively, the pulse sensor and the encoder are used for detecting the rotating speed of the flywheel and the rotating speed of the hydraulic motor driving shaft respectively, and the control system controls the hydraulic pump to start and stop working. The method is suitable for various working conditions and application scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hydraulic drive mechanism, especially a hydraulic drive and flywheel integrated power device. BACKGROUND

[0002] The traditional power device often adds a hydraulic accumulator station or a hydraulic power unit when driving large tonnage and fast displacement conditions. The accumulator can stack energy together and distribute energy again in the cycle. This control method has low energy utilization efficiency, poor system stability, slow response speed, large installation position, high energy consumption, high failure risk, operation and maintenance challenges and other problems. SUMMARY

[0003] In order to overcome the above defects, the utility model provides a hydraulic drive and flywheel integrated power device, which can significantly improve the energy utilization efficiency of the hydraulic drive system.

[0004] The utility model discloses a hydraulic drive and flywheel integration power device, including power support frame, transmission shaft, hydraulic motor, auxiliary hydraulic pump, load, flywheel, first limit torsional coupling, second limit torsional coupling, hydraulic linkage pump group, low oil tank, first proportional control valve, second proportional control valve, first swing angle sensor, second swing angle sensor, pulse sensor, encoder and control system, the transmission shaft rotatable installation on power support frame, and hydraulic motor and hydraulic linkage pump group fixed mounting on power support frame both ends, and the power output end of hydraulic motor is connected with one end of transmission shaft one-way transmission through first torsional coupling, and the power input end of hydraulic linkage pump group is connected with the other end of transmission shaft one-way transmission through second limit torsional coupling, and the flywheel is fixedly installed on transmission shaft outside, and the flywheel can rotate with transmission shaft synchronously and provides the rotational inertia to transmission shaft, and the oil inlet of hydraulic motor and hydraulic linkage pump group is communicated with low oil tank through motor oil inlet pipeline and linkage pump oil inlet pipeline respectively, and the oil outlet of hydraulic motor and hydraulic linkage pump group is communicated with the oil inlet pipeline of load through motor oil outlet pipeline and linkage pump oil outlet pipeline respectively, be equipped with first proportional control valve and motor variable cavity on motor oil inlet pipeline, and first proportional control valve is used for controlling the pressure size of entering motor variable cavity both sides, and then control swing deflection angle's size of hydraulic motor, be equipped with second proportional control valve and linkage pump variable cavity on linkage pump oil inlet pipeline, and second proportional control valve is used for controlling the pressure size of entering linkage pump variable cavity both sides, and then control swing deflection angle's size of hydraulic linkage pump group, first swing angle sensor and second swing angle sensor are used for real-time monitoring the swash plate swing angle in motor variable cavity and linkage pump variable cavity respectively, and pulse sensor and encoder are used for detecting the rotational speed of flywheel and hydraulic motor drive shaft respectively, first swing angle sensor, second swing angle sensor, pulse sensor and encoder all are with control system electric connection communication, and auxiliary hydraulic pump can supply oil to motor oil inlet pipeline and linkage pump oil inlet pipeline, and control system controls hydraulic pump start-stop work.

[0005] As a further improvement of the utility model, a flywheel braking device is further provided, and the control system can control the flywheel braking device to brake the flywheel in a ramped manner.

[0006] As a further improvement of the utility model, a motor one-way plug-in valve is further provided on the motor oil outlet pipeline of the hydraulic motor, and a linkage pump one-way plug-in valve is further provided on the linkage pump oil outlet pipeline of the hydraulic linkage pump group, the load includes a main load oil circuit and an auxiliary load oil circuit, the motor oil outlet pipeline of the hydraulic motor provides pressure and flow to the main load oil circuit, and the linkage pump oil outlet pipeline of the hydraulic linkage pump group provides pressure and flow to the main load oil circuit and the auxiliary load oil circuit.

[0007] As a further improvement of the utility model, still be equipped with load loop drive system, including load loop drive cylinder, third proportional control valve, first load coupling valve, second load coupling valve, first check valve, second check valve, and oil return pipeline, the main load oil circuit supplies oil to load loop drive cylinder, be equipped with first load coupling valve on main load oil circuit, first load coupling valve is responsible for the pressure and flow of main load oil circuit is introduced into load loop drive cylinder, the oil outlet of load loop drive cylinder passes through third proportional control valve and second check valve and enters oil return pipeline, oil return pipeline communicates with the oil inlet pipeline of hydraulic motor, still be equipped with second load coupling valve and first check valve on oil return pipeline.

[0008] As a further improvement of the utility model, the oil inlet end of motor oil inlet pipeline and linkage pump oil inlet pipeline is connected on total oil supply pipeline, total oil supply pipeline communicates with low oil tank, auxiliary hydraulic pump can hit the hydraulic oil in low oil tank into total oil supply pipeline, be equipped with oil pressure control system and first accumulator on total oil supply pipeline, oil pressure control system includes oil pressure sensor and control valve group, oil pressure sensor is used to detect the oil pressure on total oil supply pipeline and signals to control system, control system adjusts the oil pressure in total oil supply pipeline through control valve group, first accumulator can absorb the pressure pulsation of auxiliary hydraulic pump 29 when loading and convert it into emergency electric energy, be equipped with second accumulator and flow sensor on oil return pipeline.

[0009] As a further improvement of the utility model, still be equipped with high oil tank, hydraulic cutoff valve, third check valve, high oil tank oil return pipe, high oil tank oil return switch valve and high oil tank oil return pump, the height of high oil tank is higher than low oil tank and hydraulic motor, the oil outlet pipeline of high oil tank communicates with oil return pipeline, hydraulic cutoff valve and third check valve are equipped on the oil outlet pipeline of high oil tank and are used to control the on-off and flow direction of the oil outlet pipeline of high oil tank respectively, high oil tank oil return pipe communicates with low oil tank, high oil tank oil return switch valve control valve is equipped on high oil tank oil return pipe and is used to control the on-off of high oil tank oil return pipe, high oil tank oil return pump is used to hit the hydraulic oil in low oil tank into high oil tank.

[0010] As a further improvement of the utility model, the hydraulic linkage pump group includes coaxially connected first hydraulic double pump and second hydraulic double pump, the first hydraulic double pump and second hydraulic double pump are respectively provided with first linkage pump variable cavity and second linkage pump variable cavity, first hydraulic double pump and second hydraulic double pump are respectively provided with first linkage pump check valve and second linkage pump check valve on the oil outlet pipeline.

[0011] As a further improvement of the utility model, hydraulic oil regulation system is further provided, including circulating pump, temperature device, cooling control valve, heat exchanger, heater, air filter, filter and liquid level sensor, temperature device, heater and liquid level sensor are located in low oil tank, temperature device can detect oil temperature in low oil tank in real time, temperature device is electrically connected with control system and communicates feedback oil temperature in low oil tank, low oil tank is sequentially communicated with heat exchanger and filter through circulating pipeline, and both ends of circulating pipeline are communicated with low oil tank, circulating pump makes the hydraulic oil of low oil tank sequentially pass heat exchanger and filter, and then returns to low oil tank after cooling and filtering, heater can heat the hydraulic oil in low oil tank, liquid level sensor is used to detect the liquid level of hydraulic oil in low oil tank and transmit detection information to control system, control system can control control valve to open cooling water inlet pipeline of heat exchanger, and control system can also control heater and circulating pump to start and stop.

[0012] As a further improvement of the utility model, flywheel vacuum chamber is further fixedly installed on the power support frame, the flywheel vacuum chamber is vacuumized by the vacuum motor, the flywheel vacuum chamber discharges air through the vacuum control valve, the flywheel vacuum chamber is further provided with a vacuum gauge for measuring the vacuum condition inside the vacuum chamber and a vacuum sensor for calibrating the reading error of the vacuum gauge, and the inner side wall of the vacuum chamber is further provided with sound-absorbing cotton.

[0013] As a further improvement of the utility model, first transmission bearing and second transmission bearing are arranged at intervals on the power support frame, the transmission shaft is inserted into the first transmission bearing and the second transmission bearing, first limit stop ring, second limit stop ring and third limit stop ring are arranged at intervals on the transmission shaft, the opposite axial end faces of the first limit stop ring and the second limit stop ring are tightly abutted on the opposite axial end faces of the first transmission bearing and the second transmission bearing respectively, the flywheel is arranged outside the transmission shaft through a flywheel bearing, first flywheel support disc and second flywheel support disc are coaxially arranged at the two axial ends of the flywheel respectively, the first flywheel support disc is stopped on the axial end face of the third limit stop ring, the second flywheel support disc is tightly clamped outside the transmission shaft through a flywheel locking disc to realize fixed connection with the transmission shaft, an axial extension oil passage hole is further arranged in the transmission shaft, the oil passage hole is communicated with the first transmission bearing and the flywheel bearing through first branch and second branch extending in radial direction respectively, the first transmission bearing and the second transmission bearing are further communicated with lubricating oil passage respectively, a lubricating oil switch valve is arranged on the lubricating oil passage, axial sealing and radial sealing are further arranged on the second flywheel support disc to seal the gap between the bearing and the second branch of the oil passage hole.

[0014] The utility model discloses the beneficial effect is: the utility model discloses through the combination of hydraulic drive and flywheel forms integrated power device, realizes the conversion and transmission between mechanical energy and hydraulic energy, utilizes hydraulic oil as pressure transmission medium simultaneously, realizes the storage and release of energy through the high -speed rotation of flywheel and hydraulic motor, still through the control and adjusting mechanism of hydraulic circuit to ensure the stable operation and high energy conversion of system in system operation process, the utility model has efficient energy conversion and transmission, stability performance and reliability, compact structure and high power density, easily realizes stepless speed regulation and overload protection and practicality is strong and the advantage such as flexibility, compared with traditional hydraulic power unit electric power change is big, power consumption is relatively strong, and the load fluctuation of power grid is big, the integrated design of hydraulic drive and flywheel of the utility model reduces the loss of energy in the conversion and transmission process, and the utility model still forms closed loop control strategy through hydraulic linkage pump group, reduces the loss of energy to the maximum, the integrated power device of hydraulic drive and flywheel of the utility model does not produce harmful material emission in the operation process, and it is friendly to the environment also meets the global environmental protection and sustainable development requirement, the utility model can adopt load energy recovery technology and be applicable to various working conditions and application scene, especially the working condition of variable load force and periodic gap performance energy supply. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structure principle diagram of the utility model;

[0016] Figure 2 It is Figure 1 The enlarged view of A part in the middle;

[0017] Figure 3 The utility model discloses the hydraulic principle diagram;

[0018] Figure 4 It is Figure 3 The enlarged view of B part in the middle. DETAILED DESCRIPTION

[0019] Embodiment: a hydraulic drive and flywheel integrated power device, comprising a power support frame, a transmission shaft, a hydraulic motor, an auxiliary hydraulic pump 29, a load, a flywheel, a first torque limiting coupling, a second torque limiting coupling, a hydraulic linkage pump group, a low oil tank 49.0, a first proportional control valve 12, a second proportional control valve 25, a first swing angle sensor 13, a second swing angle sensor 28, a pulse sensor 17, an encoder 14 and a control system, the transmission shaft is rotatably mounted on the power support frame, the hydraulic motor and the hydraulic linkage pump group are fixedly mounted on both ends of the power support frame, the power output end of the hydraulic motor is connected with one end of the transmission shaft through the first torque limiting coupling for one-way transmission, the power input end of the hydraulic linkage pump group is connected with the other end of the transmission shaft through the second torque limiting coupling for one-way transmission, the flywheel is fixedly installed outside the transmission shaft, the flywheel can rotate synchronously with the transmission shaft and provide rotational inertia to the transmission shaft, the oil inlet of the hydraulic motor and the hydraulic linkage pump group is communicated with the low oil tank 49.0 through the motor oil inlet pipeline and the linkage pump oil inlet pipeline respectively, the oil outlet of the hydraulic motor and the hydraulic linkage pump group is communicated with the oil inlet pipeline of the load through the motor oil outlet pipeline and the linkage pump oil outlet pipeline respectively, the motor oil inlet pipeline is provided with the first proportional control valve 12 and the motor variable cavity, the first proportional control valve 12 is used to control the pressure on both sides of the motor variable cavity, thereby controlling the swing angle of the hydraulic motor (and thereby controlling the pressure and flow of the hydraulic motor), the linkage pump oil inlet pipeline is provided with the second proportional control valve 25 and the linkage pump variable cavity, the second proportional control valve 25 is used to control the pressure on both sides of the linkage pump variable cavity, thereby controlling the swing angle of the hydraulic linkage pump group, the first swing angle sensor 13 and the second swing angle sensor 28 are used to monitor the swash plate swing angle of the motor variable cavity and the linkage pump variable cavity respectively (the larger the swash plate swing angle, the more the oil outlet of the variable cavity), the pulse sensor 17 and the encoder 14 are used to detect the rotational speed of the flywheel and the hydraulic motor drive shaft respectively, the first swing angle sensor 13, the second swing angle sensor 28, the pulse sensor 17 and the encoder 14 are electrically connected with the control system for communication, the auxiliary hydraulic pump 29 can supply oil to the motor oil inlet pipeline and the linkage pump oil inlet pipeline, and the control system controls the start and stop of the hydraulic pump.

[0020] The device is mainly divided into two parts, which are mechanical structure part and hydraulic unit. The working principle of the hydraulic drive and flywheel integrated power device is to realize the conversion and transmission between mechanical energy and hydraulic energy through hydraulic pump and hydraulic motor, and to realize the storage and release of energy through the high-speed rotation of flywheel and hydraulic motor. In the process of system operation, the control and adjustment mechanism of hydraulic circuit is also needed to ensure the stable operation and high energy conversion of the system.

[0021] The hydraulic control main circuit is mainly composed of a hydraulic motor and a hydraulic linkage pump group, and the energy of the flywheel is used for energy storage.

[0022] The flywheel operation mode can be divided into: starting flywheel, flywheel acceleration, energy maintenance, energy release.

[0023] Starting flywheel: auxiliary hydraulic pump can supply oil to the motor oil pipeline, start the hydraulic motor, the hydraulic motor drives the transmission shaft to rotate through the first torque limiter coupling, and then drives the flywheel to rotate, at the same time, the transmission shaft drives the hydraulic linkage pump group drive shaft to rotate synchronously under the action of the first torque limiter coupling, and the hydraulic motor and the hydraulic linkage pump start to suck oil from the low oil tank; The first torque sensor 51.1 and the second torque sensor 62.1 are respectively installed on the first torque limiter coupling and the second torque limiter coupling, which are used to monitor the running state of the first torque limiter coupling 51 and the second torque limiter coupling 62, and when the limited torque is exceeded, the first torque sensor 51.1 and the second torque sensor 62.1 send error information to the control system. The first torque sensor 51.1 and the second torque sensor 62.1 are used to monitor the first torque limiter coupling and the second torque limiter coupling to provide overload protection when rotating at high speed. When the torque transmitted by the flywheel 16 exceeds the maximum torque that the hydraulic motor 11 and the hydraulic linkage pump group can withstand, the first torque limiter coupling 51 and the second torque limiter coupling 62 can automatically slip or separate, thereby preventing the hydraulic motor 11 and the hydraulic linkage pump group from being damaged due to overload. This protection function is crucial to ensure the stable operation of the system and prolong the service life of the equipment.

[0024] The hydraulic linkage pump group may encounter sudden changes in load during hydraulic drive operation, and the first torque limiter coupling 51 and the second torque limiter coupling 62 can absorb and buffer these load changes, allowing the flywheel 16, the hydraulic motor 11 and the hydraulic linkage pump group to operate in more stable conditions. This helps to reduce system vibration and impact, improve system stability and reliability.

[0025] The power support frame 68 is used to support the flywheel 16, the hydraulic motor 11 and the hydraulic linkage pump group, and is designed according to the maximum inertia generated when they rotate at high speed. The power support frame 68 has a load-bearing and strong hardness, and in order to prevent resonance phenomenon, the power support frame 68 is equipped with shock-absorbing pads 71 at the bottom.

[0026] Flywheel acceleration: Hydraulic oil enters the motor variable cavity 11.0 through the spool of the first proportional control valve 12. The first proportional control valve 12 controls the pressure and flow rate of the hydraulic motor by controlling the displacement of the spool on the a side or b side. The purpose is to control the swing angle of the hydraulic motor, so as to control the displacement and flow rate of the hydraulic motor. The first swing angle sensor 13 installed on the motor variable cavity monitors the swing angle of the hydraulic motor 11 in real time. Under the pressure of the auxiliary hydraulic pump 29, the hydraulic oil enters the hydraulic motor and is converted into mechanical energy, which drives the flywheel 16 to rotate and accelerate. During the rotation of the flywheel 16, the pulse sensor 17 detects the rotation speed of the flywheel in real time. At the same time, the encoder 14 on the hydraulic motor drive shaft also reads the rotation speed of the drive shaft in real time. When the readings of the pulse sensor 17 and the encoder 14 exceed the limit tolerance range, the hydraulic motor 11 will stop rotating, thereby protecting the transmission mechanical structure. Under the action of the first torque limiting coupling, the flywheel and the transmission shaft will continue to rotate. When the flywheel reaches a certain speed, the energy of the flywheel has been stored;

[0027] Energy maintenance: The first proportional control valve 12 of the hydraulic motor 11 and the second proportional control valve 25 of the hydraulic linkage pump group control the motor variable cavity 11.0 and the linkage pump variable cavity to have no pressure and flow rate output from the hydraulic motor 11 and the hydraulic linkage pump group at a relative position;

[0028] Energy release: When the load requests pressure and flow rate, the control system starts to release the flywheel energy. Under the displacement of the a side or b side of the proportional valve spool, the swing angle of the motor variable cavity 11.0 of the hydraulic motor 11 and the linkage pump variable cavity of the hydraulic linkage pump group start to change. Under the action of pressure, the hydraulic motor 11 and the hydraulic linkage pump group respectively suck oil through the S port and discharge oil through the B port. The oil outlet of the hydraulic motor 11 and the oil outlet of the hydraulic linkage pump group provide pressure and flow rate to the load. At the same time of energy release, the rotation speed of the flywheel 16 also starts to decrease. When the rotation speed is lower than a certain value, the hydraulic motor 11 stops driving. After the flywheel energy is released, the next flywheel acceleration starts.

[0029] The hydraulic drive system is particularly important for application scenarios that require precise control. The addition of the flywheel system can further stabilize the output of the system, because the flywheel can provide or absorb a large amount of energy in a short time to balance the fluctuations of the system.

[0030] The connection between the hydraulic drive shaft and the flywheel transmission shaft in the integrated hydraulic drive and flywheel power device adopts a torque limiting coupling with monitoring function, which meets the requirements of transmission efficiency, torque transmission, axial displacement and radial displacement compensation, and is suitable for variable load working conditions.

[0031] The flywheel brake device is controlled by the control system to brake the flywheel in a ramped manner.

[0032] Flywheel brake: during the flywheel acceleration, the pulse sensor 17 detects the flywheel 16 speed, if no feedback signal is received within a specified time and other abnormal conditions of the power device, the control system triggers the flywheel brake signal, the flywheel ramps down until a set range and stops, avoiding hard stop to further damage the transmission mechanical structure.

[0033] After the flywheel 16 stops, the first proportional control valve 12 of the hydraulic motor 11 and the second proportional control valve 25 of the hydraulic linkage pump group release the pressure inside the motor variable chamber 11.0 and the linkage pump variable chamber. The hydraulic motor 11 and the hydraulic linkage pump group swing back to the initial position.

[0034] The motor one-way plug-in valve is arranged on the motor oil outlet pipeline of the hydraulic motor, and the linkage pump one-way plug-in valve is arranged on the linkage pump oil outlet pipeline of the hydraulic linkage pump group. The load includes a main load oil path and an auxiliary load oil path. The hydraulic motor 11 motor oil outlet pipeline provides pressure and flow to the main load oil path, and the linkage pump oil outlet pipeline of the hydraulic linkage pump group provides pressure and flow to the main load oil path and the auxiliary load oil path.

[0035] A load circuit driving system is also provided, including a load circuit driving cylinder Y6.2, a third proportional control valve Y1, a first load coupling valve, a second load coupling valve, a first one-way valve, a second one-way valve Y5, and a return oil pipeline. The main load oil path supplies oil to the load circuit driving cylinder Y6.2. The first load coupling valve is arranged on the main load oil path and is responsible for guiding the pressure and flow of the main load oil path into the load circuit driving cylinder Y6.2. The oil outlet of the load circuit driving cylinder Y6.2 enters the return oil pipeline through the third proportional control valve Y1 and the second one-way valve Y5. The return oil pipeline communicates with the oil inlet pipeline of the hydraulic motor. The second load coupling valve and the first one-way valve are also arranged on the return oil pipeline.

[0036] When the load needs to move in the opposite direction, the cylinder piston of the load circuit driving cylinder Y6.2 needs to return under the resistance of the load. The internal hydraulic oil needs to pass through the third proportional control valve Y1 to be released. The third proportional control valve Y1 controls the pressure and speed of the load circuit driving cylinder Y6.2. The pressure and flow released by the third proportional control valve Y1 enter the hydraulic motor 11 through the second one-way valve Y5, the second load coupling valve Y3, and the first one-way valve Y4.

[0037] The oil inlet end of the motor oil inlet pipeline and the linkage pump oil inlet pipeline is connected to the general oil supply pipeline, the general oil supply pipeline is communicated with the low oil tank 49.0, the auxiliary hydraulic pump 29 can pump the hydraulic oil in the low oil tank 49.0 into the general oil supply pipeline, the general oil supply pipeline is provided with an oil pressure control system and a first accumulator 33, the oil pressure control system includes an oil pressure sensor 33.0 and a control valve group 30, the oil pressure sensor 33.0 is used for detecting the oil pressure on the general oil supply pipeline and signaling to the control system, the control system adjusts the oil pressure in the general oil supply pipeline through the control valve group 30, and the first accumulator 33 can absorb the pressure pulsation of the auxiliary hydraulic pump 29 during loading and convert it into emergency electric energy, and the oil return pipeline is provided with a second accumulator 27.1 and a flow sensor 5.

[0038] The control valve group is used for adjusting the outlet pressure of the auxiliary hydraulic pump 29, and the faster the rotating speed of the flywheel 16 is, the greater the pressure is; the first accumulator 33 can damp the auxiliary hydraulic pump 29 during loading, the pressure released by the third proportional control valve Y1 under the load resistance has acceleration, so the second accumulator 27.1 is matched to absorb the pulsation, and the flow sensor 5 detects the flow rate of the pipeline. The first accumulator 33 and the second accumulator can also serve as an emergency power source when power suddenly stops.

[0039] A high oil tank Y6.3, a hydraulic cutoff valve Y6.1, a third one-way valve Y6, a high oil tank oil return pipeline, a high oil tank oil return switch valve 49 and a high oil tank oil return pump are further provided, the high oil tank is higher than the low oil tank 49.0 and the hydraulic motor, the oil outlet pipeline of the high oil tank is communicated with the oil return pipeline, the hydraulic cutoff valve Y6.1 and the third one-way valve Y6 are arranged on the oil outlet pipeline of the high oil tank and are respectively used for controlling the on-off and flow direction of the oil outlet pipeline of the high oil tank, the high oil tank oil return pipeline is communicated with the low oil tank 49.0, the high oil tank oil return switch valve 49 is arranged on the high oil tank oil return pipeline and is used for controlling the on-off of the high oil tank oil return pipeline, and the high oil tank oil return pump is used for pumping the hydraulic oil in the low oil tank 49.0 into the high oil tank Y6.3.

[0040] (High tank Y6.3 stores a large amount of hydraulic oil, and an oil pipe is connected at the bottom of the tank as the oil outlet pipeline of the high tank, which is equipped with a hydraulic shut-off valve Y6.1 and a third one-way valve Y6. The oil pipe will have a convergence point with the second accumulator 27.1. The high position of the high tank Y6.3, the hydraulic drive and the power device of the flywheel are located below, which uses the height difference and the gravitational acceleration of the hydraulic oil in the pipeline to achieve a potential energy. When the second load coupling valve Y3 is closed, under the action of pressure, hydraulic oil will enter the hydraulic motor 11 through the second one-way valve Y5, and under the action of pressure and flow, the hydraulic motor 11 starts to rotate to drive the flywheel energy storage. When the flywheel 16 reaches a certain speed, the energy is stored well, the second load coupling valve Y3 loses power, and the load circuit stops driving the hydraulic motor 11. A small amount of oil in the high tank Y6.3 will leak into the low tank 49.0 through the hydraulic motor 11. The bottom of the low tank is connected with the high tank return valve 49 and the fourth one-way valve 43, and the high tank return pipe is connected, so that the hydraulic oil in the low tank can be reconnected to the high tank Y6.3. The hydraulic motor 11 and the hydraulic linkage pump group are respectively provided with motor shut-off valve 11.1 and linkage pump shut-off valve, which can be closed when maintenance is needed.

[0041] The hydraulic linkage pump group includes coaxially connected first hydraulic double pump 18 and second hydraulic double pump 27, which are respectively provided with first linkage pump variable cavity 18.0 and second linkage pump variable cavity 27.0, and first hydraulic double pump 18 and second hydraulic double pump 27 are respectively provided with first linkage pump one-way plug-in valve and second linkage pump one-way plug-in valve. As long as the power is allowed to be driven by the hydraulic motor 11, the hydraulic linkage pump group is not limited to two pumps, and multiple pumps are also within the protection scope of the application.

[0042] The hydraulic oil regulating system is provided with a circulating pump 40, a temperature detector 37, a cooling control valve 47, a heat exchanger 46, a heater 48, an air filter 38, a filter 44 and a liquid level sensor 39. The temperature detector 37, the heater 48 and the liquid level sensor 39 are arranged in the low-position oil tank 49.0. The temperature detector 37 can detect the oil temperature in the low-position oil tank 49.0 in real time. The temperature detector 37 is electrically connected to the control system and communicates the oil temperature in the low-position oil tank 49.0. The low-position oil tank 49.0 is sequentially communicated with the heat exchanger 46 and the filter 44 through a circulating pipeline. The two ends of the circulating pipeline are communicated with the low-position oil tank 49.0. The circulating pump 40 makes the hydraulic oil in the low-position oil tank 49.0 sequentially pass through the heat exchanger 46 for cooling and the filter 44 for cleaning and then return to the low-position oil tank 49.0. The heater 48 can heat the hydraulic oil in the low-position oil tank 49.0. The liquid level sensor 39 is used for detecting the liquid level of the hydraulic oil in the low-position oil tank 49.0 and transmitting the detection information to the control system. The control system can control the cooling control valve 47 to open the cooling water inlet pipeline of the heat exchanger 46. The control system can also control the start and stop of the heater 48 and the circulating pump 40.

[0043] The circulating pump 40 circulates and cleans the oil in the low-position oil tank 29. When the oil temperature is higher than the deviation set value of the temperature detector 37, the cooling control valve 47 is opened, and the cooling water passes through the heat exchanger 46 to replace the temperature of the hydraulic oil. The filter 44 is responsible for cleaning the hydraulic oil in the low-position oil tank 49.0. A differential pressure switch is preferably arranged on the filter pipeline. When the oil pressure in the filter exceeds the differential pressure switch, the control system sends a request to replace the filter. When the temperature 37 detects that the oil temperature is lower than the warning value, the heater 48 is started to heat the oil in the oil tank until it returns to the normal temperature range. This prevents the pump from being damaged by sucking low-temperature hydraulic oil. When the liquid level 39 detects that the liquid level is lower than the warning value, the control system alarms to supplement the hydraulic oil in time. The circulating pump 40 also has a branch to the inside of the hydraulic linkage pump group to provide low-pressure lubricating oil.

[0044] The power support frame is also fixedly provided with a flywheel vacuum chamber 63. The flywheel vacuum chamber is vacuumized by a vacuum motor 65. The flywheel vacuum chamber 63 is air discharged through a vacuum control valve 65.2. The flywheel vacuum chamber 63 is also provided with a vacuum gauge 64 for measuring the vacuum condition in the flywheel vacuum chamber 63 and a vacuum sensor 65.1 for calibrating the reading error of the vacuum gauge 64. The inside wall of the flywheel vacuum chamber 63 is also provided with sound-absorbing cotton 63.1.

[0045] The flywheel vacuum chamber forms a vacuum environment to reduce the wind resistance loss of the flywheel 16 during rotation, avoid the consumption of energy and reduce the efficiency of the system due to the resistance of air during the energy storage process of the flywheel 16.

[0046] The power support frame is provided with first transmission bearing 52 and second transmission bearing 60 at intervals, the transmission shaft is inserted into the first transmission bearing 52 and the second transmission bearing 60, the first limiting stop ring 53, the second limiting stop ring 61 and the third limiting stop ring 54 are provided at intervals on the transmission shaft, the opposite axial end faces of the first limiting stop ring 53 and the second limiting stop ring 61 are respectively tightly abutted on the opposite axial end faces of the first transmission bearing 52 and the second transmission bearing 60, the flywheel 16 is sleeved outside the transmission shaft through the flywheel bearing 56, the first flywheel support disc 55 and the second flywheel support disc 59.1 are coaxially arranged at the axial two ends of the flywheel 16 respectively, the first flywheel support disc 55 is stopped on the axial end face of the third limiting stop ring 54, the second flywheel support disc 59.1 is tightly clamped outside the transmission shaft through the flywheel locking disc 59 to realize the fixed connection with the transmission shaft, an axial extending oil passage hole 69 is further arranged in the transmission shaft, the oil passage hole 69 is respectively communicated with the first transmission bearing 52 and the flywheel bearing 56 through the first branch 69.2 and the second branch 69.3 extending in the radial direction, the first transmission bearing 52 and the second transmission bearing 60 are further respectively communicated with the lubricating oil passage, the lubricating oil switch valve 67 is arranged on the lubricating oil passage, the gap between the flywheel bearing 56 and the second branch 69.3 of the oil passage hole is further sealed through the axial sealing element 58 and the radial sealing element 58.1 on the second flywheel support disc 59.1.

[0047] The first flywheel support disc 55 and the second flywheel support disc 59.1 and the first, second and third limiting stop rings 53, 54 and 61 are used for fixing the connection between the flywheel and the bearing. Displacement and misplacement are prevented during high-speed operation. The flywheel locking disc 59 is used for fixing the position of the flywheel to prevent the axial deviation of the flywheel. The axial sealing 58 and the radial sealing element 58.1 inside the flywheel support disc are used for sealing the oil passage inside the flywheel. The flywheel will generate high temperature during high-speed rotation. It is ensured that the bearing is sufficiently lubricated with oil, and the temperature is reduced while the leakage is prevented. The power device support structure 68 bears the entire hydraulic drive and the flywheel 16, and the sufficient strength and shock pad 71 ensure the stability and safety of the entire system.

[0048] The flywheel transmission shaft is provided with an oil passage hole 69 and an oil passage plug 69.1, and the first branch 69.2 and the second branch 69.3 of the oil passage constitute a lubricating oil passage. The switch valve 67 can control the lubricating oil provided externally to the flywheel transmission shaft bearing and the flywheel internal bearing. During the rotation of the flywheel, the bearing bears a huge load and friction. By connecting the external circulating lubricating oil through the switch valve 67, a layer of oil film can be formed on the contact surface of the bearing, which can effectively isolate the direct contact between metals, thereby significantly reducing friction and wear, which not only prolongs the service life of the bearing, but also maintains the stability and precision of the flywheel 16 during rotation, and reduces the noise generated by the flywheel during high-speed rotation. A large amount of heat will be generated when the flywheel 16 rotates at high speed. If the heat cannot be dissipated in time, the temperature of the first transmission bearing 52, the second transmission bearing 60, the flywheel bearing 56 and the flywheel support disc 57 will rise, thereby affecting their performance and service life. Through the external circulating lubricating oil system of the switch valve 16, the heat generated by the first transmission bearing 52, the second transmission bearing 60, the flywheel bearing 56 and the flywheel support disc 57 can be taken away and dissipated to the external environment, thereby keeping the temperature within a reasonable range. In addition, the lubricating oil also has a lubricating effect, which can reduce the heat generated by friction. The working environment of the flywheel 16, the first transmission bearing 52, the second transmission bearing 60, the flywheel bearing 56 and the flywheel support disc 57 is often complex, and may be invaded by dust, moisture and other foreign matters. These foreign matters not only increase the wear and failure rate of the first transmission bearing 52, the second transmission bearing 60, the flywheel bearing 56 and the flywheel support disc 57, but also may affect the performance of the flywheel 16. By connecting the external circulating lubricating system, a protective layer can be formed between the first transmission bearing 52, the second transmission bearing 60, the flywheel bearing 56 and the flywheel support disc 57 to effectively prevent foreign matters from entering, thereby ensuring the cleanliness and stability of the system.

[0049] The first transmission bearing 52, the second transmission bearing 60, the flywheel bearing 56 and the flywheel support disc 57 are usually made of metal materials, which are easy to rust and corrode when exposed to humid or corrosive environments for a long time. The additives in the lubricating oil can prevent the first transmission bearing 52, the second transmission bearing 60, the flywheel bearing 56 and the flywheel support disc 57 from rusting and corroding to some extent, thereby prolonging their service life.

[0050] The first flywheel support disc 55 and the second flywheel support disc 59.1 are provided with a circumferential seal 58 and a radial seal 58.1 for sealing the oil passage hole to prevent leakage of lubricating oil, which may cause damage to the flywheel bearing system due to lack of oil.

Claims

1. A hydraulic drive integrated power plant with a flywheel, characterized in that: The power support frame, transmission shaft, hydraulic motor, auxiliary hydraulic pump (29), load, flywheel, first torque limiting coupling, second torque limiting coupling, hydraulic linkage pump group, low oil tank (49.0), first proportional control valve (12), second proportional control valve (25), first swing angle sensor (13), second swing angle sensor (28), pulse sensor (17), encoder (14) and control system, the transmission shaft is rotatably mounted on the power support frame, the hydraulic motor and the hydraulic linkage pump group are fixedly mounted on both ends of the power support frame, the power output end of the hydraulic motor is connected with one end of the transmission shaft through the first torque limiting coupling for one-way transmission, the power input end of the hydraulic linkage pump group is connected with the other end of the transmission shaft through the second torque limiting coupling for one-way transmission, the flywheel is fixedly installed outside the transmission shaft, the flywheel can rotate synchronously with the transmission shaft and provide rotational inertia to the transmission shaft, the oil inlet of the hydraulic motor and the hydraulic linkage pump group is communicated with the low oil tank through the motor oil inlet pipeline and the linkage pump oil inlet pipeline respectively, the oil outlet of the hydraulic motor and the hydraulic linkage pump group is communicated with the oil inlet pipeline of the load through the motor oil outlet pipeline and the linkage pump oil outlet pipeline respectively, the motor oil inlet pipeline is provided with the first proportional control valve and the motor variable cavity, the first proportional control valve is used for controlling the pressure on both sides of the motor variable cavity, thereby controlling the swing angle of the hydraulic motor, the linkage pump oil inlet pipeline is provided with the second proportional control valve and the linkage pump variable cavity, the second proportional control valve is used for controlling the pressure on both sides of the linkage pump variable cavity, thereby controlling the swing angle of the hydraulic linkage pump group, the first swing angle sensor and the second swing angle sensor are used for monitoring the swing angle of the motor variable cavity and the linkage pump variable cavity respectively, the pulse sensor and the encoder are used for detecting the rotating speed of the flywheel and the hydraulic motor drive shaft respectively, the first swing angle sensor, the second swing angle sensor, the pulse sensor and the encoder are electrically connected with the control system, the auxiliary hydraulic pump can supply oil to the motor oil inlet pipeline and the linkage pump oil inlet pipeline, and the control system controls the hydraulic pump to start and stop working.

2. The hydraulic drive and flywheel integrated power plant of claim 1, wherein: The flywheel brake device is also provided, and the control system can control the flywheel brake device to brake the flywheel in a ramped manner.

3. The hydraulic drive and flywheel integrated power plant of claim 1, wherein: The motor one-way plug-in valve is further arranged on the motor oil outlet pipeline of the hydraulic motor, the linkage pump one-way plug-in valve is further arranged on the linkage pump oil outlet pipeline of the hydraulic linkage pump group, the load includes the main load oil circuit and the auxiliary load oil circuit, the motor oil outlet pipeline of the hydraulic motor provides pressure and flow to the main load oil circuit, and the linkage pump oil outlet pipeline of the hydraulic linkage pump group provides pressure and flow to the main load oil circuit and the auxiliary load oil circuit.

4. The hydraulic drive and flywheel integrated power plant of claim 3, wherein: The load circuit driving system comprises a load circuit driving cylinder (Y6.2), a third proportional control valve (Y1), a first load coupling valve, a second load coupling valve, a first check valve, a second check valve (Y5), and an oil return pipeline. The main load oil circuit supplies oil to the load circuit driving cylinder. The first load coupling valve is arranged on the main load oil circuit and is responsible for guiding the pressure and flow of the main load oil circuit into the load circuit driving cylinder. The oil outlet of the load circuit driving cylinder enters the oil return pipeline through the third proportional control valve and the second check valve. The oil return pipeline is in communication with the oil inlet pipeline of the hydraulic motor. The oil return pipeline is also provided with the second load coupling valve and the first check valve.

5. The hydraulic drive and flywheel integrated power plant of claim 4, wherein: The oil inlet ends of the motor oil inlet pipeline and the linkage pump oil inlet pipeline are connected to the total oil supply pipeline. The total oil supply pipeline is in communication with the low-position oil tank. The auxiliary hydraulic pump can pump hydraulic oil in the low-position oil tank into the total oil supply pipeline. The total oil supply pipeline is provided with an oil pressure control system and a first accumulator (33). The oil pressure control system comprises an oil pressure sensor (33.0) and a control valve group (30). The oil pressure sensor is used to detect the oil pressure on the total oil supply pipeline and send signals to the control system. The control system adjusts the oil pressure in the total oil supply pipeline through the control valve group. The first accumulator can absorb the pressure pulsation of the auxiliary hydraulic pump (29) during loading and convert it into emergency electric energy. The oil return pipeline is provided with a second accumulator and a flow sensor (5).

6. The hydraulic drive and flywheel integrated power plant of claim 5, wherein: A high-position oil tank (Y6.3), a hydraulic shut-off valve (Y6.1), a third check valve (Y6), a high-position oil tank oil return pipeline, a high-position oil tank oil return on-off valve (49), and a high-position oil tank oil return pump are also provided. The high-position oil tank is higher than the low-position oil tank and the hydraulic motor. The oil outlet pipeline of the high-position oil tank is in communication with the oil return pipeline. The hydraulic shut-off valve and the third check valve are arranged on the oil outlet pipeline of the high-position oil tank and are used to control the on-off and flow direction of the oil outlet pipeline of the high-position oil tank, respectively. The high-position oil tank oil return pipeline is in communication with the low-position oil tank. The high-position oil tank oil return on-off valve is arranged on the high-position oil tank oil return pipeline and is used to control the on-off of the high-position oil tank oil return pipeline. The high-position oil tank oil return pump is used to pump hydraulic oil in the low-position oil tank into the high-position oil tank.

7. The hydraulic drive and flywheel integrated power plant of claim 1, 3 or 6, wherein: The hydraulic linkage pump group comprises coaxially connected first and second hydraulic duplex pumps (18 and 27). The first and second hydraulic duplex pumps are respectively provided with first and second linkage pump variable cavities (18.0 and 27.0). First and second linkage pump check valves are respectively arranged on the oil outlet pipelines of the first and second hydraulic duplex pumps.

8. The hydraulic drive and flywheel integrated power plant of claim 2, wherein: The hydraulic oil regulating system is provided with a circulating pump (40), a temperature device (37), a cooling control valve (47), a heat exchanger (46), a heater (48), an air filter (38), a filter (44) and a liquid level sensor (39). The temperature device, the heater and the liquid level sensor are arranged in the low-position oil tank. The temperature device can detect the oil temperature in the low-position oil tank in real time. The temperature device is electrically connected with the control system to communicate and feedback the oil temperature in the low-position oil tank. The low-position oil tank is sequentially communicated with the heat exchanger and the filter through a circulating pipeline. The two ends of the circulating pipeline are communicated with the low-position oil tank. The circulating pump enables the hydraulic oil in the low-position oil tank to sequentially pass through the heat exchanger and the filter to return to the low-position oil tank after cooling and cleaning. The heater can heat the hydraulic oil in the low-position oil tank. The liquid level sensor is used to detect the liquid level of the hydraulic oil in the low-position oil tank and transmit the detection information to the control system. The control system can control the cooling control valve (47) to open the cooling water inlet pipeline of the heat exchanger. The control system can also control the start and stop of the heater and the circulating pump.

9. The hydraulic drive and flywheel integrated power plant of claim 1, wherein: The flywheel vacuum chamber is vacuumized by a vacuum motor (65) and air is discharged from the flywheel vacuum chamber through a vacuum control valve (65.2). The flywheel vacuum chamber is also provided with a vacuum gauge (64) for measuring the vacuum condition inside the vacuum chamber and a vacuum sensor (65.1) for calibrating the reading error of the vacuum gauge. The inside wall of the vacuum chamber is also provided with sound-absorbing cotton (63.1).

10. The hydraulic drive and flywheel integrated power device according to claim 1, characterized in that: The power support frame is provided with a first transmission bearing (52) and a second transmission bearing (60) at intervals. The transmission shaft is inserted into the first transmission bearing and the second transmission bearing. The transmission shaft is provided with a first limiting stop ring (53), a second limiting stop ring (61) and a third limiting stop ring (54) at intervals. The opposite axial end faces of the first limiting stop ring and the second limiting stop ring are tightly abutted against the opposite axial end faces of the first transmission bearing and the second transmission bearing, respectively. The flywheel is sleeved outside the transmission shaft through a flywheel bearing (56). The flywheel has a first flywheel support disc (55) and a second flywheel support disc (59.1) coaxially arranged at the two axial ends of the flywheel, respectively. The first flywheel support disc is stopped on the axial end face of the third limiting stop ring. The second flywheel support disc is tightly clamped outside the transmission shaft through a flywheel locking disc to realize fixed connection with the transmission shaft. An axial extending oil passage hole (69) is arranged in the transmission shaft. The oil passage hole is communicated with the first transmission bearing and the flywheel bearing through a first branch (69.2) and a second branch (69.3) extending in the radial direction, respectively. The first transmission bearing and the second transmission bearing are also communicated with a lubricating oil passage, respectively. A lubricating oil switch valve (67) is arranged on the lubricating oil passage. The second flywheel support disc is also provided with an axial seal (58) and a radial seal (58.1) for sealing the gap between the second branch of the oil passage hole and the bearing.

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